1. Nervous System

2. Nervous System
How did our nervous system work in the Impulse Activity we just completed?
We sensed the touch.
A message was sent to our brain.
Our brain sent a message to our muscles.
Our muscles squeezed the hand.

3. Organs of the Nervous System
Brain= uses information it receives from nerve impulses to coordinate actions

4. Organs of the Nervous System
Nerves= carry messages
throughout the
body

5. Organs of the Nervous System
Spinal Cord= Central communication system.
Nerve center
Messages are sent to the brain through the spinal cord.
Exception: Reflexes skip the spinal cord and go straight to the brain.

6. Functions of the Nervous System
Functions include:
Control center
Communication network
Coordinates all actions and reactions
Send messages as electrical impulses

7. Functions of the Nervous System
Functions include:
Allows us to
Think
Evaluate
Remember

8. Functions of the Nervous System
Functions include:
Sensory Input- Senses send messages to the brain.
Integration- The brain interprets and translates.
Motor Output- The brain sends messages to body.

9. Functions of the Nervous System
Functions include:
– Central Nervous
System- Maintains
homeostasis by
regulating vital body
functions such as
breathing, heart rate,
hormones, etc.

10. Functions of the Nervous System
Functions include:
– Peripheral
Nervous System-
Sensory Neurons- Carry information toward the central nervous system
Motor Neurons- Send impulses away from the central nervous system

11. Integumentary System

12. Integumentary System Composed of skin, hair, sweat glands, and nails
The name is derived from the Latin integumentum, which means “a covering.”
The skin, considered the largest human organ, covers the body.
The hair covers the head and other parts of the body.
The nails cover the tops of the fingers and toes.

13. Integumentary System Functions include:
Protects the body’s internal tissues and organs against infectious organisms and injury
Prevents loss of body fluids

14. Integumentary System Functions include:
Regulates body temperature through sweat and regulating peripheral blood flow
Removes waste from the body through perspiration
Generates vitamin D through exposure to UV light

15. Integumentary System Functions include:
Protects against sunburns from UV rays
Stores fat for fuel and insulation
Sensory organ with receptors for touch, pressure, pain, heat, and cold

16. Integumentary System
Hair is composed of strong, dead protein called keratin.
This same protein makes up the nails and outer layer of skin.
Most of the keratin people interact with is dead.
The body sheds the old cells as new cells push up from underneath.